Reasons for Inaccurate Readings of Mettler pH Meter
What is the reason for the inaccurate reading of the Mettler pH meter? Many people know that there is a problem with the Mettler pH meter or the Mettler pH electrode, but in many cases, it is caused by improper operation or other external conditions. Some reasons for the inaccurate pH meter readings, I hope it will be helpful to the majority of users.
1. The Mettler pH meter or pH electrode is damaged
If we use a Mettler pH meter to measure the pH value of the Mettler standard buffer solution, the pH meter reading does not change, such as using a Mettler acidity meter FE20K to measure the Mettler pH4.01 buffer solution and Mettler pH7 When the pH value of the buffer solution is 0.0, the FE20K keeps the reading unchanged. If the power supply and the electrode cable are connected correctly, it means that there is a problem with the FE20K host or its standard pH electrode LE438, and the host or the pH electrode needs to be repaired.
2. Mettler pH electrode failure
As mentioned in the first point above, it is also possible that the LE438 electrode has lost its activity and needs to be activated. After activation, it will return to normal. For the specific operation steps, you can refer to the previous introduction on the activation of the pH electrode on the Mettler Instrument Network. .
3. Changes in temperature or the sample itself cause inaccurate readings of the Mettler pH meter
Sometimes, after we measure the pH value of a sample at a certain point in time, we get a pH data. After a period of time, we take the same sample for measurement, and the pH value may change. The previous Mettler instrument Net has also received similar consultation calls. This is mainly caused by changes in temperature or the sample itself, which requires keeping the temperature of the measurement environment constant. After the measurement changes the sample, care should be taken to preserve it.
4. Improper calibration of Mettler pH meter causes reading difference
When calibrating the Mettler pH meter, if the wrong calibration buffer set is selected, or the calibration is not performed at 25 °C and the temperature compensation is not performed, the measured value will differ.
